Add a read/write sysctl for reconfiguring the maximum number of physical

pages that can be wired.

Submitted by:	Eugene Grosbein
PR:		114654
MFC after:	6 weeks

sys/vm/vm_pageout.c

@@ -206,6 +206,8 @@ SYSCTL_INT(_vm, OID_AUTO, pageout_lock_miss,
 int vm_pageout_page_count = VM_PAGEOUT_PAGE_COUNT;
 
 int vm_page_max_wired;		/* XXX max # of wired pages system-wide */
+SYSCTL_INT(_vm, OID_AUTO, max_wired,
+	CTLFLAG_RW, &vm_page_max_wired, 0, "System-wide limit to wired page count");
 
 #if !defined(NO_SWAPPING)
 static void vm_pageout_map_deactivate_pages(vm_map_t, long);